US10073118B2 - Method for contacting at least two metal electrodes and arrangement - Google Patents

Method for contacting at least two metal electrodes and arrangement Download PDF

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Publication number
US10073118B2
US10073118B2 US14/479,537 US201414479537A US10073118B2 US 10073118 B2 US10073118 B2 US 10073118B2 US 201414479537 A US201414479537 A US 201414479537A US 10073118 B2 US10073118 B2 US 10073118B2
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United States
Prior art keywords
basic body
electrodes
hole
cable
solder
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Expired - Fee Related, expires
Application number
US14/479,537
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English (en)
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US20150069999A1 (en
Inventor
Stephan Buschnakowski
Alexander Serfling
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Endress and Hauser Conducta GmbH and Co KG
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Endress and Hauser Conducta GmbH and Co KG
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Application filed by Endress and Hauser Conducta GmbH and Co KG filed Critical Endress and Hauser Conducta GmbH and Co KG
Assigned to ENDRESS + HAUSER CONDUCTA GESELLSCHAFT FUR MESS- UND REGELTECHNIK MBH + CO. KG reassignment ENDRESS + HAUSER CONDUCTA GESELLSCHAFT FUR MESS- UND REGELTECHNIK MBH + CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BUSCHNAKOWSKI, STEFAN, SERFLING, ALEXANDER
Publication of US20150069999A1 publication Critical patent/US20150069999A1/en
Assigned to ENDRESS+HAUSER CONDUCTA GMBH+CO. KG reassignment ENDRESS+HAUSER CONDUCTA GMBH+CO. KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG
Priority to US16/101,643 priority Critical patent/US10509055B2/en
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Publication of US10073118B2 publication Critical patent/US10073118B2/en
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/073—Multiple probes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0016—Brazing of electronic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
    • G01N27/07—Construction of measuring vessels; Electrodes therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B23K2101/38—Conductors

Definitions

  • the invention relates to a method for contacting at least two metal electrodes as well as an arrangement comprising a contacting of at least two metal electrodes.
  • the invention relates further to a conductivity sensor comprising such an arrangement.
  • a conductive conductivity sensor This includes at least two electrodes, which when measuring are immersed in the measured medium. For determining the electrolytic conductivity of the measured medium, the resistance or conductance of the electrode measuring path in the measured medium is determined. In the case of known cell constant, the conductivity of the measured medium can then be ascertained therefrom.
  • the electrodes are connected by means of a line or cable with a measurement transmitter, in which the conductivity is ascertained based on the measurement data.
  • the contacting of the electrodes to the line will now be explained based on FIG. 1 .
  • the electrodes 3 contact the measured medium at their ends 8 and extend from there rearwards through the basic body 2 and out the other side.
  • the electrodes are there provided with connections 11 , which are, in turn, connected with the measurement transmitter.
  • connections 11 are either special plug- or screw contacts or in the simplest case cable is soldered to the connections 11 . In both cases it is, however, necessary that the electrodes protrude out from the basic body. Since, most often, platinum is used as electrode material, this is very expensive.
  • An object of the invention is to provide a cost saving solution for contacting electrodes.
  • the object is achieved by a method, an arrangement and a conductivity sensor comprising such an arrangement.
  • the object is achieved in the context of features including that at least two metal electrodes are located in a cavity of a basic body of sintered ceramic and frontal end faces of the metal electrodes are arranged essentially planparallel to an outer surface of the basic body.
  • the method includes steps as follows: introducing a solder means into at least one hole of the basic body, wherein the hole is so embodied that it leads to a rear portion of a metal electrode away from the frontal end face of the metal electrode, wherein the solder means can wet the rear portion of the metal electrode, wherein the metal electrodes are in their longitudinal direction shorter than the basic body, especially have only 1 ⁇ 5 of the length of the basic body; introducing a cable into the hole at least until the cable extends into the solder means; and heating the basic body with solder means and cable above the solidification temperature of the solder means.
  • the solder means is injected by means of air pressure into the hole. It is therewith possible to move the solder means into the hole right up to the rear end face of the metal electrode.
  • a cartridge or cannula with a length, which corresponds at least to the depth of the hole can be used.
  • the hole is half filled with solder means. This has proven to be a sufficient amount for a stable contacting.
  • solder paste is used as solder means and the basic body, with solder means and cable, is heated above the melting temperature of the solder paste.
  • electrically conductive adhesive is used as solder means and the basic body, with solder means and cable, is heated above the curing temperature of the electrically conductive adhesive.
  • the object is achieved by an arrangement comprising: a basic body of sintered ceramic; at least two metal electrodes, wherein the metal electrodes are located in a cavity in the basic body and at least the frontal end faces of the metal electrodes are arranged essentially planparallel to an outer surface of the basic body, wherein the metal electrodes are shorter than the basic body, especially they are only 1 ⁇ 5 of the length of the basic body, wherein the basic body has at least one hole, wherein the hole is so embodied that it leads to a rear portion of a metal electrode away from the frontal end face of the metal electrode; at least one cable, which extends into the hole, wherein a solder means, especially a solder paste, or an electrically conductive adhesive, connects the cable with the metal electrode electrically and mechanically.
  • a solder means especially a solder paste, or an electrically conductive adhesive
  • the end faces of the metal electrodes are planparallel to one another and/or to an outer surface of the basic body, while the end faces can be offset rearwards within the hole or extend frontally beyond the basic body.
  • the end faces of the metal electrodes are arranged flushly with the outer surface of the basic body. This facilitates a hygienic embodiment.
  • the metal electrodes can contact the surrounding medium.
  • the ceramic is zirconium dioxide and the metal electrodes are platinum electrodes.
  • the zirconium dioxide is magnesium-, aluminum- or iridium stabilized.
  • At least one metal electrode is embodied as a cylinder, whose height essentially equals its diameter.
  • at least one metal electrode is embodied as a hollow cylinder, whose height essentially equals its lateral thickness.
  • An embodiment as a cylinder is especially advantageous, although other shapes, such as cuboid or especially cube, provide other options.
  • metal electrodes are provided and the metal electrodes are embodied as cylinders, or the metal electrodes are embodied as hollow cylinders, wherein the hollow cylinders are arranged concentrically.
  • metal electrodes are provided and the metal electrodes are embodied as cylinders, wherein the cylinders are arranged in a row, or at least three metal electrodes are embodied as hollow cylinders, wherein the hollow cylinders are arranged concentrically and one metal electrode is arranged as a cylinder in the center of the hollow cylinders.
  • the cable includes an insulation, especially a polytetrafluoroethylene coating, wherein the insulation is removed in the part of the cable contacting the solder means.
  • the object is further achieved by a conductivity sensor, especially by a conductive conductivity sensor, comprising an arrangement as described above.
  • FIG. 1 the state of the art
  • FIG. 2 is, in cross section, a first embodiment of the arrangement of the invention.
  • FIG. 3 is, in cross section, a second embodiment of the arrangement of the invention.
  • the arrangement of the invention bears in its totality the reference character 1 and is presented in FIG. 1 .
  • the invention will be explained based on a conductivity sensor, especially based on a conductive conductivity sensor.
  • the basic idea is, however, applicable also to other types of sensors that use metal electrodes.
  • Other options include the most varied of sensors from the field of process automation, such as, for instance, pH-sensors, amperometric sensors, etc.
  • FIGS. 2 and 3 show a conductivity sensor, with a basic body 2 of a ceramic such as, for instance, zirconium dioxide, thus generally of an electrically non-conductive material.
  • the zirconium dioxide is magnesium-, aluminum- or iridium stabilized.
  • metal electrodes 3 Embedded in the basic body 2 , more exactly in a cavity 10 thereof, are metal electrodes 3 , for instance, of platinum.
  • the electrodes 3 and the basic body 2 form a composite material, i.e. are, for instance, sintered together. In this way, no measured medium can penetrate into the interior of the basic body 2 .
  • the frontal end faces of the electrodes 3 lie freely exposed and in the case of a measuring of conductivity contact the measured medium.
  • the end faces of the electrodes 3 and the end faces of the basic body are flush with one another, i.e. lie in the same plane.
  • the electrodes can also protrude out from the basic body 2 or be arranged sunken in the basic body 2 .
  • the arrangement 1 shown in FIGS. 2 and 3 forms the measuring probe of a so-called 4-electrode sensor.
  • the probe is immersible in a measured medium.
  • Two of the electrodes 3 especially two electrodes 3 directly adjoining one another, are operated as so called electrical current electrodes.
  • the two remaining electrodes 3 are operated as so called voltage electrodes.
  • An alternating voltage is applied between the two electrical current electrodes in measurement operation and therewith an alternating electrical current is caused to flow in the measured medium. Measured, especially by a currentless measuring, between the voltage electrodes is the resulting potential difference.
  • the impedance of the conductivity measurement cell formed by immersion of the arrangement 1 in a measured medium is calculated, from which, taking into consideration the cell constant, the specific resistance, respectively the conductivity, of the measured medium can be ascertained.
  • a measurement transmitter (not shown) connected with the arrangement 1 .
  • the connection is accomplished, for instance, via connections 11 .
  • the measuring electronics can be a component of the measurement transmitter or be at least partially accommodated in a separate module, for example, in a plug head connected with the arrangement 1 .
  • the ascertained measured values can either be displayed by the measurement transmitter or output to a superordinated control system. Alternatively to a measurement transmitter, the measured values can also be transmitted directly to a bus; in that way, the arrangement is directly connected with the control system.
  • a 2-electrode sensor provides an option.
  • the construction is, in such case, basically equal.
  • a 2-electrode sensor in measurement operation, an alternating voltage is applied to the two electrodes 3 .
  • the impedance of the conductivity measurement cell formed by the measuring probe immersed in the measured medium is ascertained.
  • the specific resistance, respectively the specific conductivity, of the measured medium can be ascertained therefrom.
  • the ascertained measured values can either be displayed by the measurement transmitter or output to a superordinated control system.
  • a part of the functions of the measurement transmitter can be executed by a measuring electronics accommodated in a separate housing outside of the measurement transmitter. This measuring electronics can at least in part, be accommodated, for example, in a plug head connected with the arrangement 1 .
  • FIG. 2 respectively FIG. 3 , for reasons of perspicuity, only one of the electrodes is provided with reference characters.
  • the electrodes 2 are embodied as cylinders. Compared with the length of the basic body, the electrodes are very much shorter. They are, for instance, only 1 ⁇ 5 of the length of the basic body. As an example, the basic body 2 has a height of 10 mm. The electrodes 2 then have a length of, for instance, 1 mm to 3 mm, for example, 2 mm or less, for instance, 1.5 mm.
  • FIG. 3 shows an alternative embodiment for conductive conductivity measurement, in the case of which the electrodes 3 are hollow cylinders arranged coaxially about a shared rotational symmetry axis A and embedded insulated from one another in the basic body 2 .
  • the central electrode 3 is embodied as a solid cylinder.
  • the electrodes 3 lie on the end face 8 of the basic body 2 with their annular end faces freely exposed.
  • the height of the hollow cylinders essentially equals their wall thickness. Compared with the length of the basic body 2 , thus, also in this embodiment, the electrodes 3 are clearly shorter.
  • Holes 9 lead from the rear-side of the basic body to the electrodes 3 .
  • solder means 6 is introduced into these holes 9 .
  • Used for this procedure is, for instance, a cartridge or cannula with a length equaling at least the depth of the holes 9 .
  • the solder means 6 can wet at least the electrode 3 . It has been found to be advantageous to fill the holes 9 , for instance, half way with solder means 6 .
  • the solder means is a solder paste or a conductive adhesive.
  • the cable has an insulation 5 , for example, of Teflon polymer, which is, however, removed from the part of the cable 4 contacting the solder means.
  • the basic body 2 with the cable 4 and the solder means 6 is heated above the solidification temperature of the solder means 6 .
  • This can be accomplished, for instance, in a furnace, for example, in a high frequency oven. Alternatively, a heated support can be used.
  • the solidification temperature is understood to be the melting temperature of the solder paste.
  • the individual particles of the paste melt and coalesce and, in each case, upon cooling form a mechanically stable connection as well as an electrical connection of electrode 3 to cable 4 .
  • a typical melting temperature is, for instance, 260° C.
  • the solidification temperature is understood to be the curing temperature of the adhesive.
  • the melting of the solder means 6 leads to an electrical (low ohm) and mechanical connection between electrode 2 and cable 4 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
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  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
US14/479,537 2013-09-12 2014-09-08 Method for contacting at least two metal electrodes and arrangement Expired - Fee Related US10073118B2 (en)

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Application Number Priority Date Filing Date Title
US16/101,643 US10509055B2 (en) 2013-09-12 2018-08-13 Method for contacting at least two metal electrodes and arrangement

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DE102013110044.9 2013-09-12
DE102013110044 2013-09-12
DE201310110044 DE102013110044A1 (de) 2013-09-12 2013-09-12 Verfahren zur Kontaktierung von zumindest zwei Metallelektroden und Anordnung

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DE102015212655A1 (de) * 2015-07-07 2017-01-12 Gestra Ag Messsonde zum Erfassen mindestens einer Messgröße eines Fluids
DE102016117984B4 (de) * 2016-09-23 2021-02-18 Kuntze Instruments Gmbh Vergussverfahren zum Anbringen von mindestens zwei Elektroden an einer elektrochemischen Messzelle mit einem ablösbaren Montagehilfsträger
CN106645306A (zh) * 2017-02-09 2017-05-10 中国科学院计算技术研究所 电导率传感器的电极装置
CN108318536B (zh) * 2018-02-02 2020-03-31 张立红 智能在线分析仪探头
CN109142462B (zh) * 2018-06-22 2021-05-04 思贝科斯(北京)科技有限公司 电导探针及其制造方法
EP3599471A1 (de) * 2018-07-26 2020-01-29 IMEC vzw Vorrichtung zur messung von oberflächeneigenschaften eines materials
JP2021503591A (ja) * 2018-11-02 2021-02-12 ハンズ レーザー テクノロジー インダストリー グループ カンパニー リミテッド 品質検査装置、方法、システム及び一体型プローブ組立体
CN109596677A (zh) * 2018-11-02 2019-04-09 大族激光科技产业集团股份有限公司 一种质量检测装置、方法、系统及一体式探针组件
DE102019110920A1 (de) * 2019-04-26 2020-10-29 Jumo Gmbh & Co. Kg Messelektrode für elektrochemische Messungen und Verfahren zur Herstellung einer Messelektrode

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DE3010470A1 (de) 1980-03-19 1981-10-01 Dr. Eduard Fresenius, Chemisch-pharmazeutische Industrie KG, 6380 Bad Homburg Verfahren zur herstellung eines elektrochemischen messfuehlers
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US4118663A (en) 1977-10-11 1978-10-03 Thomas-Barben Instruments Four electrode conductivity sensor
DE3010470A1 (de) 1980-03-19 1981-10-01 Dr. Eduard Fresenius, Chemisch-pharmazeutische Industrie KG, 6380 Bad Homburg Verfahren zur herstellung eines elektrochemischen messfuehlers
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EP1089072A2 (de) 1999-09-28 2001-04-04 PharmaSerV Marburg GmbH & Co. KG Leitfähigkeitssensor
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DE102005016798A1 (de) 2005-04-12 2006-10-19 Robert Bosch Gmbh Brennstoffeinspritzventil
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CN102539932A (zh) 2010-10-19 2012-07-04 恩德莱斯和豪瑟尔测量及调节技术分析仪表两合公司 电导率传感器
US20130098976A1 (en) * 2011-10-19 2013-04-25 Lotes Co., Ltd. Method for forming electrical connector
DE102011117115A1 (de) 2011-10-27 2013-05-02 Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg Elektrochemischer Multisensor
DE202012000569U1 (de) 2012-01-20 2013-04-23 Seuffer Gmbh & Co.Kg Sensorvorrichtung zur Erfassung von Flüssigkeitseigenschaften
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US20140224860A1 (en) * 2013-02-11 2014-08-14 International Business Machines Corporation Fill head interface with combination vacuum pressure chamber

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Publication number Publication date
US20180348258A1 (en) 2018-12-06
DE102013110044A1 (de) 2015-03-12
CN104459332B (zh) 2018-03-13
US10509055B2 (en) 2019-12-17
CN104459332A (zh) 2015-03-25
US20150069999A1 (en) 2015-03-12

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